Add method to grab an I/O thread
- replaces #toLowerCase() with #toLowerCase(Locale).
  #toLowerCase() without a Locale may lead to unexpected
  results in JVM with Turkish locale (s. JavaDocs of
  String#toLowerCase()).
XNIO-210 SSL awaitReadable() always waits on the underlying channel even if there is data in the unwrap buffer
Add automatic ref infrastructure for native impl and other usages
XNIO-208 Add writeFinal and sendFinal method to channels

This allows for optimisation of protocols that require writing
termination data, such as HTTP chunking.
Prep 3.2.0.Beta1
Next is 3.2.0.Beta2
Hold the buffer lock in awaitReadable()
Prep 3.2.0.Beta2
Next is 3.2.0.Beta3
Update JavaDocs and code formatting fixes
XNIO-212 Sporadic failure in native FileSystemWatcherTestCase.testFileSystemWatcher
Only configure a send buffer size if it is in the option map